Is x4 + y4 > z4 ?
(1) x2 + y2 > z2
(2) x + y > z
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
我的思路:
1.分别把三个平方视为三角形的三边,那么A就不一定对
2.考虑正负数的情况,很容易得出不一定的答案
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